Be sure to make sure nothing is bugging your system up.
Trendmicro HousecallTrendMicro online virus and spyware scanner
Defragment hardrive(s) by going to
Start\Programs\Accessories\System Tools\Disk Defragmenter\
This tweak makes it so Oblivion doesn't thread load.
Go to
My Documents\My games\Oblivion\Oblivion.ini
Search for these certain threads and change them to what is listed
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[OPENMP]
iThreads=20
iOpenMPLevel=20
iPreloadSizeLimit=1000000000
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This tweak can increase performance by up to 10 FPS, it stops Oblivion from thread loading, and your computer looks like it shouldn't have thread loading problems though. It probably will help though